WWE.com posted the following regarding Sin Cara's health status after being attacked by the group on this past Tuesday's live edition of Smackdown:

Two days after being attacked by The Shield on SuperSmackDown LIVE, Sin Cara tweeted Thursday that he will undergo surgery. The masked Superstar offered no specifics on the procedure or the extent of his injury, though it was previously reported The Shield's ambush caused a right knee injury that was described as "serious."

Dean Ambrose, Seth Rollins and Roman Reigns attacked Sin Cara following his match against Damien Sandow. As Ambrose and Reigns restrained the luchador still, Rollins came off the top rope with a knee drop onto Sin Cara's outstretched right leg. That same night, The Shield assaulted Sin Cara's tag team partner, Rey Mysterio. According to reports, Mysterio sustained a "severe" neck injury.

Stay with WWE.com as updates on the status of Sin Cara's injury become available. To watch The Shield's attack in its entirety, tune in to a rebroadcast of SuperSmackDown on Syfy, this Friday at 8/7 CT.

Wrestlezone had previously reported Sin Cara was looking to take time off to take care of a nagging injury, which would explain the attack by The Shield.